Coil-box for telephones.



No. 718,371. I PATENTED JAN. 13, 1903,

W. E. MGOORMIOK.

COIL BOX FOR 'IIELEPHONES.

v APPLIGATION FILED MAY 4, 1901.

N0 MODEL.

f ii Eli Ill

HE Nonms PEYERS 60.. murquma. WASNINGTON n c UNrrn STATES ATVENT OFFICE.

WILLIAM PLMCCORMICK, OF CHICAGO, ILLINOIS, ASSIGNOR TO INTERNA- TIONAL TELEPHONE MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

COIL-BOX FOR TELEPHONES.

SPECIFICATIONforming part of Letters Patent No. 718,371, dated January 13,

Application filed May 4, 1901.

To all whom it may concern.- I

Be it known that I, WILLIAM E. MCCOR- MICK, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Coil-Boxes for Telephones, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

In telephones of the transmitter-arm type as heretofore generally constructed the transmitter-arms have been connected usually by hinges to suitable coil boxes secured by screws to the wall or backboard. In such construction the cast-metal box is provided with a series of exterior contact-posts, which are all exposed and in position to be easily tampered with and removed; also, the necessity of inspecting and testing the induction- 2o coil which is contained within the coil-box renders the removal of the box from its support necessary, and after it has been removed two or three times the holes in the support in which the retaining-screws take become worn and the connection'of the parts is rendered unstable.

The principal object of my invention is to overcome these and other objections incident to the employment of the described type of 0 coil-boxes.

Another object of my invention is to provide an improved arrangement and organization of parts, whereby the induction-coil may be more effectually and easily exposed 5' for inspection and testing and whereby one induction-coil maybe readily substituted for another.

With these and other objects in view the invention includes certain particular arrange- 4o ments, constructions, and combinations of parts, as hereinafter -fully set forth, and pointed out in the claims at the end of this specification.

In the accompanying drawings, forming a 5 part of the present specification, Figure 1 is a front view of my improved coil-box, showing the lid of the box opened and turned on its hinges to expose the interior parts. Fig.

2 is a perspective View of the coil-box of Fig. 1 with the lid partly swung back. Fig. 3 is Serial No. 58,722. (No model.)

a longitudinal section of my improved coilbox with a suitable hollow transmitter-arm attached.

' Referring to the drawings, the referenceletter A represents'a hollow transmitter-arm formed of cast metal and preferably hinged and adapted to swing vertically upon suitable pivots or trunnions which are formed on the projecting lugs b of the coil-box B. The

and provided with openings to receive the usual conductors by which the windings of the coil and the transmitter are included in the circuit. This may be conveniently and simply accomplished by forming the base or back plate with a suitable opening. The induction-coil I is mounted upon the baseplate, preferably by means of a supportingframe F, which may be conveniently constituted of the square ends S andS of the usual hollow wooden spool carrying the windings and a longitudinal connecting-piece S of suitable insulating material, which carries the requisite number of binding-posts 2, 3, 4, and 5, preferably in the form of screws. The ends S S of the frame, which is, in elfect, a yoke carrying all the parts, are secured to the base by suitable threaded bolts 6, engaging tapped holes in the base, and the secondary and primary windings of the coil are connected to the binding-screws by any suitable terminals, from which they are in electrical connection with their associated parts by suitable conductors, which are not shown in the drawings. By this organization and construction of parts the coil and the terminals of its windings and their associated binding-posts comprise a self-contained or unitary device which maybe assembled or disassembled with 100 rectangular plate of suitable outline and size relation to a suitable coil-box by merely disconnecting the external conductors from the binding-posts and removing the retainingscrews 6. By this arrangement I am enabled to quickly and easily change or substitute one coil for another.

The body b of the coil box is of any suitable shape adapted to inclose the coil and is preferably composed of a hollow casing, preferably of the form shown in the drawings, and provided With a surrounding flange b of the same size as the base. To afford access to the interior of the box, I prefer to pivot or hinge the body thereof to the base by suitable hinges at one edge, although the lid-section of the box may not necessarily comprise the entire body thereof, but may include only a portion thereof. A suitable lock 12 is provided to engage a pin Z) to hold the swinging portion of the casing in its closed position, and the hollow transmitter'arm A is pivoted to its outer face, as above described. The swinging or hinged portion of the casing is adapted to be swung back upon its hinges to afford access to the coil and the interior conductors and connections. By this arrangement the base of the box is permanently secured to the wall or backboard without the necessity of detaching the same every time the parts are tested or repaired, and access to the parts is more easily obtained and they are more conveniently and eifectually disclosed to the operator and more conveniently disposed for inspection and testing than here- 5 tofore.

It is obvious that various changes may be made in the details of the device Without departing from the spirit and scope of my invention. For example, the induction coil may be supported by the body of the casing instead of by the base, although I prefer the latter arrangement; also, the body may be square or of other cross-sectional shape, and instead of having the entire body swing only a portion thereof, such as a lid, may be hinged to open.

Having described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. In a coil-box, the combination with a base, an induction-coil supported thereon, and carrying binding-posts, of a cover hinged to the base at one side, and provided with a pivoted transmitter-arm.

2. In a coil-box, the combination with a base, a frame removably supported on the base, and an induction-coil and binding-posts on the frame, of a cover for the parts comprising a hinged casing forming the body of the box.

3. In a coil-box, the combination with a base I), a frame removably carried on the base, binding-posts and an induction-coil on the frame, of a cover composed of a hollow casing having a flange, and hinges and a lock bet-ween said flange and base.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

NV. E. MCCORMICK.

Witnesses:

R. S. CLEMAGE, J. MOROBERTS. 

